Dowel pin



Patented May 22, i923. I

ERNEST T. KINDT, OF CLEVELAND, OHIO.

DOWEL PIN.

Application filed April 7,

T 0 all to 710m it may concern Be it known that I, ERNEST T. KINDT, a citizen of the United States, and a resident of Clevelanthcounty of Cuyahoga and State of Ohio, have invented a new and useful Improvement in Dowel Pins, of which the fol.- lowing is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

The present invention relates to metal dowel pins and means for inserting the pins properly in place, and more particularly, relates to the construction of the pins themselves and to the construction of a. suitable wrench for manipulating the pins. These present pins are adapted to bev screwed into the wooden parts which are to be held together and are so arranged that a snug fit is obtained between the two pins when they are in place in the wooden parts. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting however, but one 'of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing Fig. l is a sectional view through both male and female pins installed in a pattern; Fig. 2 is an elevational View of the male pin; Fig. 3 is an end view of the male pin; Fig. 4 is a cross section of the female pin; and Fig. 5 is a plan view of the wrench with one end in section to show the socket construction.

The present dowel pins comprise complementary male and female members 1 and 2 which are best shown in Fig. 1, each member having a screw threaded shank 3 with a thin flange 4 at its uppersurface adapted to be screwed flush with the surface of the wooden pattern 5 in which the member is to be placed. The male member 1 of the pins is provided with a pin 6 extending from the flange 4, which pin is cylindrical for a short distance 7 above the flange and is then tapered ending in a rounded nose 8. The sides are cut away as at 9 to form a squared portion for engagement by a wrench or the like. The female member 2 of the pins is likewise 1922. Serial No. 550,548.

provided with the screw threaded exterior 3 and the thin flange 4 at its upper end but is hollowed out to form a socket 10 for the pin on the, male member. This socket is provided with four V-shaped grooves 11 adapted to give the effect of a square opening therein although the cylindrical part 1.0 of the socket is of such size as to snugly receive I the circular portion 6 of the pin on the male member.

In using the present dowel pins it is most satisfactory to secure the parts of the pat-tern or core-box 5 together and to drill a hole 12 through both parts of the pattern or corebox, and then to'separate the same and insert the male and female members of the dowel pins in the apertures in the pattern or core-box. If more than one dowel pin is to be used, the core-box will again be put to gether with one set of pins in place and the next set of holes made and the pins inserted in the same manner as the first set. i i

In order to allow these dowel pins to be screwed into place into the wooden patterns, the male member has a portion of the extending pins squared so as to be engaged by the squared socket 13 in one end of a wrench '14, while the female member of the pin is provided with the-grooves forming the equivalent of a squared socket in the female member'to re ceive the squared end 15 of the wrench. This allows both members of the dowel pin to be screwed into place instead of being ham mered or driven in, as is the usual practice.

When either a screw threaded pin or one having a roughened exterior, is driven into place in the wooden pattern, the wood is crushed and the pin is very liable to be slightly tilted, and if the pin is for any reason removed, it cannot be again, inserted'in the same hole because, the crushing of the wood fibers and the tearing out of the same upon removal, increases thesize of the hole suiiicientlyto make the pin loose upon reinsertion. b

With the present dowel pins, each member is screwed into place and the thin flange which is at the upper end of the member may be secured flush with the surface of thewood and the pin is always accurately centered and may be easily removed and re-centered if necessary. The small Wrench 141 as shown, hasthe squared socket 13 at one end which has a cylindrical portion 17 adjacent the end of the wrench so as to fit around the cylindrical portion of the pin of the male in and engage with the groovesin the socket j member,-while'the other end of the wrench has the squared projection adapted'to lit of the female member.

The advantages of he present pin are thought tobe clear, inasmuch as they allow the pins to be screwed into place and thus removed when desired, and also allowing the pins to be tightened in their sockets by merely screwing them down if theybecome loosened. Further advantage is found in the fact that while both the-female member and the male member are provided with squared portions, they are also provided with cylindrical portions which allow the two members to. fit snugly together so as to prevent the pattern parts from moving out of alignment, and thus they retain the advantages of the'old forms of pins while making it possible to screw these pins into position.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being mad as regards the mechanism herein disclosed,,proeans statedby any-of the folivided the.

lowing claims or the eqi'iivalentof such stated means be employed.

I therefore particularlypoint out and distinctly'claim as my invention l. Indowelpin construction the combina tion of complementary maleand female pins, each'prov ded with a screw threaded shank hav ng a thin upper flange and meansior engagementjw'th a wrench to allow such pins tobescrewed IDtQPOSl'ClOl'L' Y 2.1a dowel ,pin' construction the combina tion' of complementary male and female to allow said pins to be screwed [into position.

,4. In dowel pin construction a male memsuch squared end and socket be]? having a screw threaded shank portion provided with a thin flange and provided with a tapered pin extending centrally from said flange, said pin being squared for en gagement with a socket wrench to allow said member to be screwed into position.

5. In. dowel pin construction a male member having a screw threaded'shank portion provided with a thin' flange and provided with a tapered pin extending centrally from said flange, said pin being cylindrical for a short distanceabove said flange and then being cut away to iorn a squared portion ending inla rounded end to allow said menr her to beengaged by a socket wrench to screw said pin into position.

6. In dowel pin construction, a female member having a screw threaded shank pro vided with a thin flange, said shank being hollow to provide a socket for the compleinentary male member,v such. socket .being groovedto provide a'squared socketto re-.

ceive a squared wrenchend to allow said member to be screwed into position.

7. In f dowel pin construction, a female member having a screw threaded shank pro- -vided with a thin flange, said shank being hollow to )rovide a socket for thecom lementary male member, such socket being provided with a plurality of bore'to snugly-receive theinale memberand to form a snared socket to receive the squared'end of a wrench to allow the mem-. her to be screwed into position.

, 8. In dowel pin construction, the combi nation oi. male and femaleymembers, each comprising a scr'ewthreaded shank portion having a thin flange, said male member havinga pin extending centrally from said flange, said pin being cylindrical for a short distance above said flange and-then tapering spaced V I grooves s0 arranged asto' leave a' cylindrical to a rounded point, the sides ofthc pin ber ing cut away to form a squared portion for engagement with: a socket wrench, saiddfe male meinber having its shankprovided with a cylindrical bore adaptedto sni'iglyreceive such cylindrical portion of said male pm, said bore being provided with V grooves adapted to form a squared socket to receive the squared end of a wrench. Signed by me this'cth day or April, 1922.

v ERNEST T. KINDT 

